Car-truck



(No Model.) i 2 Sheets-Sheet 1. W. S. G. BAKER. GAR TRUGK.

No. 426,096. Patented Apr. 22, 1890.

y ha @Homey (No Model.) l2 Sheets-Sheet 2. W. S. G. BAKER.

GAR TRUCK.

lila/4M J. C. Baken 3 iwi: amr/w35.

Patented Apr. 22, 1890.

norms versus ou., Muro-umol, wwwa-ron o c UNITED STATES PATENT OFFICE.

XVILLIAM SEBASTIAN GRAFF BAKER, 0F ALTIMORE, MARYLAND.

CAR-TRUCK.

SPECIFICATION forming part of Letters Patent No. 426,096, dated `Apr1 22, 1890.

Application tiled I'ehruaryZO, 1890. Serial No. 341,163. (No model.)

To ZZZ whom t may concern,.-

Be it known that I, XVILLIAM SEBASTIAN GRAFF BAKER, a citizen of the United States, residing at Baltimore city, in the State of Maryland, have invented certain new and useful Improvements in Car-Trucks, of which the following is a specilication.

My invention relates more especially to the organization of electric car-trucks.

In Letters Patent No. 415,802, granted to me November 26, 1889, I have shown a cartruck in which the wheel-brakes are each mounted independently on the side beams of the depending frame of the truck, which is supported from the axle-boxes bybrackets or down-hangers resting thereon. The brakes are joined by link-connections to the rockshaft extending across the truck and provided with an operating-lever. In my present invention this general organization is adhered to, but the rock-shaft is connected to the wheel-brakes by adjustable rods provided at their inner ends with curved toothed heads or racks engaging with toothed wheels or pinions on the rock-sliaft.

The details of construction and the subjectmatter claimed are hereinafter designated.

In the accompanying drawings, Figure lis a side elevation of acar-truck embodying my invention. Fig. 2 is a transverse section on the line 2 2 of Fig. 1. Fig. 3 is a detail view, partly in side elevation and partly in section, of the brake mechanism. Fig. 4 is a detail plan view of the inner ends of the rods which connect the wheehbrakes to the rock-shaft. Fig. 5 is a detail view in section on the line 5 5 of Fig. 4:.

The depending frame of the truck may be constructed with side beams A and lifeguards B and suspended from the axleboXes C by brackets or down-han gers D. The axle-boxes C are free to move vertically in pedestals E, the lower ends of which are connected by crosabolts F and framebars G, and braces H connect with the pedestals and hold them riga idly in place,A

The car^fra1ne is supported on springs I, as in my patent above mentioned.

The wheel. brakes J are independently mounted on the side beams A by vertical pivf oted links KA The lower ends of these links are pivoted to the side beams by bolts K and their upper ends are pivoted to blocks L on cross-bolts L.

tailed tongue Z, which fits in a corresponding recess Z in the outer face of the brake-shoe.

A bolt Z2 extends vertically through the backwardlyextending arms Z3 of the shoe and through the dovetaile-d block L. The end of the bolt projecting through the lower end of the brake-shoe is provided with a suitable key or linchpin Z". By this construction, it will be observed, the brake-shoe may be easily removed by withdrawing the bolt Z2 and sliding the shoe laterally relatively to the block L. The blocks L are formed with inwardlyprojecting arms M, which are screw-threaded internally and receive the screw-threaded ends of the connecting-rods \I. The opposite ends of the rods enter the internally-screwthreaded shanks O of the toothed rods or racks O. These racks are eachformed with a curved toothed portion o and with an annular guide-piece o. The guide-piece o of each toothed head embraces the shank of the opposite rack-bar and on each side of the car one vrack-bar is arranged over the rock-shaft and the other beneath it.

The rock-shaft P is mounted in suitable bearings in brackets or standards Q, secured to the side beams A, to which are also secured the channeled arch-beams R, which extend across the truck and support the devices S, to which the electric motors are secured. At each end of the rock-shaft is secured a pinion or toothed wheel p, provided with teeth p on opposite sides adapted to engage with the teeth in the rack-bars O. An operatingl'ever T, secured to the rock-shaft, may also be provided with an operatingqod T', extending to the end ofthe truck to be operated in the usual way. The brakes are normally held out of engagement with the wheels by a weighted counterbalancing-arm U, secured to the rock-shaft, preferablyimmediately below the operating-lever; or a spring may be provided for the same purpose.

In the drawings the brakes are shown as withdrawn from the wheels. By turning the lever T to the right the rock-shaft is revolved and pushes the rackbars, connectingrods,

The end of each block L' next to the wheel is provided with a doveu IOO and brakes in opposite directions to apply the brakes to the Wheels. The construction' shown is strong and powerful.

The brakes may be readily adjusted by the rods N, which are provided with opposite screw-threads on their opposite ends to compensate for Wear, each brake being independently adjustable, as it is independently mounted on the depending frame of the truck and independently connected with the rockshaft.

The brake-operating mechanism is mainly confined to the sides of the car, the only cross-connection being the rock-shaft, which does not interfere materially With the electric-motor mechanism. f*

I claim as my inventionlf The combination, substantially as hereinbefore set forth, of the car-truck, the depending frame, the Wheel-brakes, each mounted independently on the depending frame, the rock-shaft having pinions or toothed Wheels thereon, the toothed heads or rackbars engaging therewith, and the rods connectin g them With the Wheel-brakes.

2. The combination, substantially as hereinbefore set forth, of the car-truck, the Wheelbrakes, the rock-shaft extending across the truck and having pinions or toothed Wheels on its opposite ends, the toothed heads or rack-bars engaging with the pinions on the rock-shaft, and the horizontal connecting-rods extending through guides on the rack-bars and connecting the rack-bars With the Wheelbrakes.

3. The combination, substantially as hereinbefore set forth, of the car-truck, the axleboxes, the side beams of the depending frame, the brackets or down-hangers resting on the axle-boxes and supporting the side beams, the brake-shoes, the dovetailed blocks fitting in the brake-shoes, the vertical bolts securing the blocks to the shoes, the links connecting them to the side beams of the frame, and means for operating the brakes.

4. The combination, substantially as hereinbetore set forth, of the car-truck, the depending frame, the brackets secured to the frame and resting on the axle-boxes, the arched connecting-bars extending across the truck, the transverse rock-shaft, the wheelbrakes, and connections between the Wheelbrakes and the rock-shaft.

5. The combination, substantially as hereinbefore set forth, of the axle-boxes, the side beams, the brackets resting on the axle-boxes and supporting the side beams, the brakeshoes, each mounted independently on the side beams, the rock-shaft, the Weighted lever thereon, and connections between the rockshaft and the Wheel-brakes for operatin gth em.

G. The combination, substantially as hereinbefore set forth, of the Wheel-brakes, the rock-shaft, the rack-bars engaging with pinions on the rock-shaft, and the connectingrods provided with opposite screw-threads on their opposite ends and connecting the rackbars with the shoes.

In testimony whereof I have hereunto subscribed my name.

WILLIAM SEBASTIAN GRAFF BAKER. lVitnesses:

J. PAUL BAKER, C. W. KOHLMANN. 

